WO2023246051A1

WO2023246051A1 - Ratchet wrench

Info

Publication number: WO2023246051A1
Application number: PCT/CN2022/141935
Authority: WO
Inventors: 彭小湖
Original assignee: 江苏东成工具科技有限公司
Priority date: 2022-06-22
Filing date: 2022-12-26
Publication date: 2023-12-28
Also published as: CN115026751A

Abstract

A ratchet wrench, comprising: a housing extending in an axial direction, an electric motor located inside the housing, a transmission mechanism driven by means of the electric motor, and a driving mechanism connected to the transmission mechanism. The electric motor drives the driving mechanism to operate by means of the transmission mechanism. The housing comprises a base, which is used for accommodating the electric motor, and a head housing part, which is connected to the axial front end of the base, wherein the transmission mechanism and the driving mechanism are accommodated in the head housing part. The base and the head housing part are made of different materials, and the base has a specific heat capacity larger than the specific heat capacity of the head housing part, such that the thermal conductivity of the base is better than the thermal conductivity of the head housing part, thereby solving the problem of heat generation of the electric motor. The head housing part is fixedly connected to the front end of the base by means of a bolt, such that the head housing part is reliably fixed to the base without loosening.

Description

ratchet wrench

[Technical field]

The present invention relates to the technical field of wrench tools, and in particular to a ratchet wrench with a stable structure.

[Background technique]

An electric ratchet wrench is a tool that automatically tightens bolts by running a motor. It is often used to tighten high-strength bolts. The head shell of the existing ratchet wrench generally has two structures: one is a split structure, and the other is an integral structure. In the split structure, the head shell has a base and a head shell part connected to the base. The base is fixed in the left and right casings with a short fixed length. The head shell part and the base are connected through nuts; the ratchet wrench is in use during use. , the head shell is easy to loosen from the base, and the fixation of the base is not strong enough, which can easily lead to failure. In the integral structure, the head shell can wrap the brushless motor. The advantage of this is that the head shell is fixed in the casing and has a long fixed length, which makes the structure reliable. The disadvantage is that the head shell is generally made of steel material, and it wraps the brushless motor. The motor will cause iron loss, causing the ratchet wrench to heat up.

In view of this, there is a need to provide an improved ratchet wrench to overcome the shortcomings of the prior art.

[Content of the invention]

In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an improved ratchet wrench, which solves the problem of motor heating while ensuring that the head shell is reliably fixed on the base.

The technical solution adopted by the present invention to solve the existing technical problems is: a ratchet wrench, which includes an axially extending housing, a motor located in the housing, a transmission mechanism driven by the motor, and a transmission mechanism connected to the transmission mechanism. The driving mechanism of the mechanism, the motor drives the driving mechanism to operate through the transmission mechanism. The housing includes a base for housing the motor and a head shell portion connected to the axial front end of the base. The transmission mechanism and the driving mechanism are accommodated in the head shell portion. The base and The head shell parts are made of different materials, and the specific heat capacity of the base is greater than the specific heat capacity of the head shell part. The head shell part is connected and fixed to the front end of the base by bolts.

A further improvement is that the base is provided with a cylindrical portion covering the outer periphery of the motor and a base portion located at the front end of the cylindrical portion, and the base portion protrudes forward from the cylindrical portion along the axial direction. part, and the rear end of the head shell part is sleeved on the outer periphery of the base part.

A further improvement plan is: the base portion is provided with several slots recessed from the outer circumference inward, and the head shell portion is provided with several through holes radially penetrating the rear end, and the through holes are provided corresponding to the slots. , the ratchet wrench includes a plurality of fasteners partially accommodated in the through hole, and the fasteners are passed through the through hole and connected to the slot hole.

A further improvement plan is: the transmission mechanism is provided with an inner ring gear located in the head shell portion, the inner ring gear is provided with a buckle portion protruding toward the base portion, and the base is provided with a buckle portion extending from the base portion. The front end faces an inwardly recessed buckling portion, and the buckling portion is buckled with the buckling portion to fix the inner ring gear on the base.

A further improvement plan is: the motor is provided with a motor shaft extending in the axial direction and a support member sleeved on the motor shaft; the base is provided with a through groove that penetrates the base portion in the axial direction; The shaft extends into the transmission mechanism through the through slot, and the support member is received in the through slot to support the motor on the base.

A further improvement plan is: the transmission mechanism is provided with a plurality of planetary gears meshed with the motor shaft and a planetary carrier supporting a plurality of the planetary gears, and the inner ring gear meshes with the outer periphery of the plurality of planetary gears, The driving mechanism is fixedly connected to the axial front end of the planet carrier.

A further improvement is that the housing includes a main body portion covering the cylindrical portion of the base, the base is provided with several protrusions protruding outward from the cylindrical portion, and the The cylindrical part is held in the main body part by the protrusion.

A further improvement is that the ratchet wrench includes a plurality of screws corresponding to the protrusions, and the screws pass through the main body part and are fixed on the protrusions of the cylindrical part.

A further improvement is that the front end of the base is exposed from the main body part, and the base is provided with a heat dissipation port at the front end, and the heat dissipation port communicates the inside and outside of the cylindrical part.

A further improvement plan is that the base is made of aluminum, and the head shell is made of steel.

Compared with the prior art, the present invention has the following beneficial effects: the housing includes a base for housing the motor and a head shell connected to the axial front end of the base, and the transmission mechanism and the driving mechanism are accommodated in the head shell. . The base and the head shell are made of different materials, and the specific heat capacity of the base is greater than the specific heat capacity of the head shell. Therefore, the thermal conductivity of the base is better than that of the head shell, thereby solving the heating problem of the motor. The head shell part is connected and fixed to the front end of the base through bolts, so that the head shell part is reliably fixed on the base without causing loosening.

[Picture description]

The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings:

Figure 1 is a perspective view of a ratchet wrench according to a preferred embodiment of the present invention;

Figure 2 is a cross-sectional view of the ratchet wrench shown in Figure 1;

Figure 3 is a cross-sectional view of the ratchet wrench shown in Figure 1 from another angle;

Figure 4 is a perspective view of the middle head shell of the ratchet wrench shown in Figure 1;

Figure 5 is an exploded schematic view of the head shell shown in Figure 4;

Figure 6 is a perspective cross-sectional view of the head shell shown in Figure 4;

FIG. 7 is a cross-sectional view of the head case shown in FIG. 4 .

The meaning of the symbols in the figure:

100. Ratchet wrench 10. Housing 11. Base 110. Cylindrical part 111. Base 112. Slot 113. Holding part 114. Slot 115. Protrusion 116. Screw 117. Heat dissipation port 12. Head shell part 121 , through hole 122, fastener 13, main body 14, grip 15, control switch 16, lighting 20, motor 21, motor shaft 22, support 23, output tooth 24, fan 30, transmission mechanism 31, planet Wheel mechanism 311, planetary gear 312, planetary carrier 32, internal ring gear 321, snap part 40, drive mechanism 41, output shaft 411, eccentric pin 412, bushing 42, bearing 50, ratchet mechanism 51, clutch fork 511, inner Teeth 512, recess 52, ratchet assembly 521, ratchet body 522, drive head 523, pawl 60, battery pack 70, control circuit board

[Detailed ways]

The terminology used in the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. For example, the following words indicating the orientation or positional relationship such as "upper", "lower", "front" and "back" are only based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the devices/elements referred to must have a particular orientation or be constructed and operate in a particular orientation, and therefore is not to be construed as limiting the invention.

Please refer to FIGS. 1 to 4 , which shows a ratchet wrench 100 according to a preferred embodiment of the present invention, which is often used to automatically tighten bolts. The ratchet wrench 100 includes an axially extending housing 10 and a motor 20 located in the housing 10, a transmission mechanism 30, a driving mechanism 40 and a ratchet mechanism 50. The transmission mechanism 30 is connected to the axial front end of the motor 20 and It is driven by a motor 20, and the driving mechanism 40 is connected to the axial front end of the transmission mechanism 30, so that the motor 20 drives the driving mechanism 40 to operate through the transmission mechanism 30.

Please refer to Figures 5 and 6. The housing 10 includes a base 11 for housing the motor 20, a head shell portion 12 connected to the axial front end of the base 11, and a main body portion 13 covering the outer periphery of the base 11. And the holding part 14 located at the rear end of the main body part 13, the transmission mechanism 30, the driving mechanism 40 and the ratchet mechanism 50 are all accommodated in the head shell part 12, and the holding part 14 is used for the user to hold. The base 11 is provided with a cylindrical portion 110 covering the outer periphery of the motor 20 and a base portion 111 located at the front end of the cylindrical portion 110. The base portion 111 protrudes forward from the cylindrical portion 110 in the axial direction. The rear end of the head shell portion 12 is sleeved on the outer periphery of the base portion 111 .

Specifically, the base portion 111 is provided with a plurality of slots 114 that are recessed inward from the outer circumference, and the head shell portion 12 is provided with a plurality of through holes 121 radially penetrating the rear end, and the through holes 121 correspond to the slots. 114 settings. The ratchet wrench 100 includes a plurality of fasteners 122 partially received in the through hole 121 . The fasteners 122 are passed through the through hole 121 and connected to the slot hole 114 . The head shell part 12 is connected and fixed to the front end of the base 11 by bolts, so that the head shell part 12 is reliably fixed on the base 11 and will not loosen.

The main body part 13 covers the cylindrical part 110 of the base 11. The base 11 is provided with several protrusions 115 protruding outward from the cylindrical part 110, and the cylindrical part 110 passes through the protrusions. 115 is fixed in the main body 13 . Further, the ratchet wrench 100 includes a plurality of screws 116 corresponding to the protrusions 115. The screws 116 pass through the main body 13 and are fixed on the protrusions 115 of the cylindrical part 110 to stabilize the base 11. is connected to the main body 13. At the same time, in order to enable the user to easily tighten or withdraw the workpiece to be operated in a dark environment, the ratchet wrench is also provided with an illuminating lamp 16 located at the front end of the main body 13. The light outlet of the illuminating lamp 16 Towards the bottom of the ratchet mechanism 50 , that is, the light outlet of the lighting lamp 16 faces the working position of the wrench head of the ratchet mechanism 50 .

As shown in FIG. 3 , the ratchet wrench 100 is provided with a battery pack 60 located in the housing 10 and a control circuit board 70 located between the motor 20 and the battery pack 60 . Specifically, the battery pack 60 is removed from the housing 10 The rear end of the shaft is inserted and partially located in the holding portion 14 for powering the ratchet wrench 100 . The ratchet wrench 100 is also provided with a control switch 15 connected to the control circuit board 70 . The control switch 15 is partially exposed outside the gripping portion 14 of the housing 10 for the user to operate and control the ratchet wrench 100 . Start and stop.

The base 11 and the head shell 12 are made of different materials, and the specific heat capacity of the base 11 is greater than the specific heat capacity of the head shell 12; in this embodiment, the head shell 12 is made of steel material, and the head shell 12 is made of steel. The base 11 is made of aluminum material. The thermal conductivity of the base 11 is better than that of the head shell 12 and can effectively dissipate heat to the motor 20, thereby solving the heating problem of the motor 20. As shown in FIG. 7 , the motor 20 is provided with a motor shaft 21 extending in the axial direction, a support 22 sleeved on the motor shaft 21 , an output tooth 23 located at the free end of the motor shaft 21 , and a support member 22 sleeved on the motor shaft 21 . Fan 24 on 21. The base 11 is provided with a through slot 112 that penetrates the base 111 in the axial direction. The motor shaft 21 extends into the head shell portion 12 through the through slot 112 and is connected to the transmission mechanism 30 , that is, the output teeth 23 are located on the head shell. 12 and connected with the transmission mechanism 30 .

The support member 22 is received in the through slot 112 to support the motor 20 on the base 11 . In this embodiment, the support member 22 is a bearing. The front end of the base 11 is exposed from the main body 13 , and the base 11 is provided with a heat dissipation port 117 at the front end. The heat dissipation port 117 communicates the inside and outside of the cylindrical part 110 . The fan 24 is located at the axial rear end of the support member 22, and the heat dissipation port 117 of the base 11 is provided corresponding to the fan 24, so that the heat dissipation port 117 can fully dissipate the heat generated by the operation of the generator 20, thereby making it more effective. Prevent damage to the motor 20.

The transmission mechanism 30 includes a planetary gear mechanism 31 connected to the motor shaft 21 of the motor 20 and an internal ring gear 32 sleeved on the outer periphery of the planetary gear mechanism 31 . The planetary gear mechanism 31 is provided with a plurality of planetary gears 311 meshed with the motor shaft 21 and a planet carrier 312 supporting the plurality of planetary gears 311. The internal ring gear 32 meshes with the outer periphery of the plurality of planetary gears 311. The driving The mechanism 40 is fixedly connected to the axial front end of the planet carrier 312 . The internal ring gear 32 is located in the head shell portion 12 and is provided with a buckle portion 321 protruding toward the base portion 111. The base 11 is provided with a buckle portion 113 that is recessed inwardly from the front end of the base portion 111. The buckle part 321 is buckled with the buckle part 113 so that the internal ring gear 32 is stably fixed on the base 11 .

As shown in FIG. 7 , the output shaft 41 of the driving mechanism 40 is fixedly connected to the axial front end of the transmission mechanism 30 and is driven by the transmission mechanism 30 . The motor 20 drives the driving mechanism 40 to rotate in the axial direction through the transmission mechanism 30 , and The motor shaft of the motor 20 and the output shaft 41 of the driving mechanism 40 have the same rotation axis. The ratchet mechanism 50 is connected to the front end of the driving mechanism 40, and converts the rotation of the driving mechanism 40 into a vertical rotation perpendicular to the axial direction.

Specifically, the driving mechanism 40 is provided with an output shaft 41 connected to the front end of the transmission mechanism 30 and a bearing 42 sleeved around the outer circumference of the output shaft 41 . The bearing 42 is used to fix the output shaft 41 in the head shell 12 . The output shaft 41 has an eccentric pin 411 extending forward from the front end and a bushing 412 sleeved on the outer circumference of the eccentric pin 411; the eccentric pin 411 is offset by a certain distance from the axis center of the output shaft 41, and the output shaft 41 When rotating around the axial axis, the eccentric pin 411 makes a circular motion around the axial axis.

The ratchet mechanism 50 includes a clutch fork 51 located at the front end of the driving mechanism 40 and a ratchet assembly 52 located within the clutch fork 51 . The clutch fork 51 is provided with a central hole (not numbered) penetrating vertically, internal teeth 511 located on the inner wall of the central hole, and a recess 512 located at the rear end. The ratchet assembly 52 is received in the central hole. The eccentric pin 411 is received in the recess 512 through the bushing 412. When the eccentric pin 411 makes a circular motion around the axial axis, the clutch fork 51 is driven to reciprocate in a transverse direction perpendicular to the longitudinal direction.

The ratchet assembly 52 is provided with a ratchet body 521 located in a central hole, a driving head 522 vertically extending from the ratchet body 521, and a pawl 523 located on the side wall of the ratchet body 521. The pawl 523 is engaged with the inside. teeth 511, so that the reciprocating movement of the clutch fork 51 in the lateral direction is converted into a vertical rotational movement of the driving head 522.

In the present invention, the housing 10 includes a base 11 for accommodating the motor 20 and a head shell portion 12 connected to the axial front end of the base 11 . The transmission mechanism 30 and the driving mechanism 40 are accommodated in the head shell portion 12 . The base 11 and the head shell 12 are made of different materials, and the specific heat capacity of the base 11 is greater than the specific heat capacity of the head shell 12. Therefore, the thermal conductivity of the base 11 is better than that of the head shell 12, thus solving the problem. Solved the heating problem of motor 20. The head shell part 12 is connected and fixed to the front end of the base 11 by bolts, so that the head shell part 12 is reliably fixed on the base 11 and will not loosen.

The present invention is not limited to the specific embodiments described above. Those of ordinary skill in the art can easily understand that there are many alternatives to the ratchet wrench of the present invention without departing from the principles and scope of the present invention. The protection scope of the present invention shall be determined by the contents of the claims.

Claims

A ratchet wrench includes an axially extending housing, a motor located in the housing, a transmission mechanism driven by the motor, and a driving mechanism connected to the transmission mechanism. The motor is driven by the transmission mechanism. The driving mechanism operates; it is characterized in that the housing includes a base for housing the motor and a head shell connected to the axial front end of the base, and the transmission mechanism and the driving mechanism are accommodated in the In the head shell part, the base and the head shell part are made of different materials, and the specific heat capacity of the base is greater than the specific heat capacity of the head shell part, and the head shell part is connected and fixed to the head shell part by bolts. The front end of the base.
The ratchet wrench according to claim 1, wherein the base is provided with a cylindrical portion covering the outer periphery of the motor and a base portion located at the front end of the cylindrical portion, and the base portion extends along the axial direction. The cylindrical part protrudes forward, and the rear end of the head shell part is sleeved on the outer periphery of the base part.
The ratchet wrench according to claim 2, wherein the base portion is provided with a plurality of slotted holes recessed from the outer circumference inward, and the head shell portion is provided with a plurality of through holes radially penetrating the rear end, and the The through hole is arranged corresponding to the slotted hole, and the ratchet wrench includes a plurality of fasteners partially accommodated in the through hole, and the fasteners are passed through the through hole and connected to the slotted hole. .
The ratchet wrench according to claim 2, characterized in that: the transmission mechanism is provided with an internal ring gear located in the head shell part, and the internal ring gear is provided with a buckle part protruding toward the base part, so The base is provided with a buckling portion that is recessed inward from the front end of the base portion, and the buckling portion is buckled with the buckling portion to fix the inner ring gear on the base.
The ratchet wrench according to claim 4, wherein the motor is provided with a motor shaft extending in the axial direction and a support member sleeved on the motor shaft, and the base is provided with a motor shaft extending axially through the The motor shaft extends into the transmission mechanism through the slot of the base, and the support member is accommodated in the slot to support the motor on the base.
The ratchet wrench according to claim 5, wherein the transmission mechanism is provided with a plurality of planet wheels engaged with the motor shaft and a planet carrier supporting a plurality of the planet wheels, and the internal ring gear is engaged with the The outer periphery of several planet wheels, and the driving mechanism are fixedly connected to the axial front end of the planet carrier.
The ratchet wrench according to claim 2, wherein the housing includes a main body portion covering the cylindrical portion of the base, and the base has a cylindrical portion protruding outward from the cylindrical portion. A plurality of protrusions are extended, and the cylindrical part is held in the main body part by the protrusions.
The ratchet wrench according to claim 7, characterized in that: the ratchet wrench includes a plurality of screws corresponding to the protrusions, and the screws pass through the main body part and are fixed to the cylindrical part. On the bulge.
The ratchet wrench according to claim 7, wherein the front end of the base is exposed from the main body, and the base is provided with a heat dissipation port at the front end, and the heat dissipation port is connected to the cylindrical part inside and outside.
The ratchet wrench according to claim 1, wherein the base is made of aluminum, and the head shell is made of steel.